kernel/linux.git/arch/xtensa/include/asm/bitops.h, branch v6.12.81Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v6.12.812022-05-02T02:51:22+00:00xtensa: enable KCSAN2022-05-02T02:51:22+00:00Max Filippovjcmvbkbc@gmail.com2019-10-05T06:33:31+00:00urn:sha1:725aea873261e8d986e527838fde2a721f0962d8
Prefix arch-specific barrier macros with '__' to make use of instrumented
generic macros.
Prefix arch-specific bitops with 'arch_' to make use of instrumented
generic functions.
Provide stubs for 64-bit atomics when building with KCSAN.
Disable KCSAN instrumentation in arch/xtensa/boot.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Marco Elver <elver@google.com>
include: move find.h from asm_generic to linux2022-01-15T16:47:31+00:00Yury Norovyury.norov@gmail.com2021-08-14T21:16:59+00:00urn:sha1:47d8c15615c0a2046d2d90b04cb80b81ddf31fb1
find_bit API and bitmap API are closely related, but inclusion paths
are different - include/asm-generic and include/linux, correspondingly.
In the past it made a lot of troubles due to circular dependencies
and/or undefined symbols. Fix this by moving find.h under include/linux.
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
xtensa: use "m" constraint instead of "a" in bitops.h assembly2019-11-26T19:33:38+00:00Max Filippovjcmvbkbc@gmail.com2019-10-16T05:17:33+00:00urn:sha1:5bf67094a3a2d99d5f96db30be286f6c41988177
Use "m" constraint instead of "r" for the address, as "m" allows
compiler to access adjacent locations using base + offset, while "r"
requires updating the base register every time.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: use named assembly arguments in bitops.h2019-11-26T19:33:38+00:00Max Filippovjcmvbkbc@gmail.com2019-10-16T05:14:15+00:00urn:sha1:e444917019258ef3bd564d0b4a432add2c26a2ae
Numeric assembly arguments are hard to understand and assembly code that
uses them is hard to modify. Use named arguments in BIT_OP and
TEST_AND_BIT_OP macros.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: use macros to generate *_bit and test_and_*_bit functions2019-11-26T19:33:38+00:00Max Filippovjcmvbkbc@gmail.com2019-10-16T05:04:13+00:00urn:sha1:b387dc044efaa07cd8a47316c83fe2a5c08f9650
Parameterize macros with function name, opcode and inversion pattern.
This reduces code duplication removing 2/3 of definitions.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: fix change_bit in exclusive access option2019-10-16T07:14:33+00:00Max Filippovjcmvbkbc@gmail.com2019-10-16T04:51:43+00:00urn:sha1:775fd6bfefc66a8c33e91dd9687ed530643b954d
change_bit implementation for XCHAL_HAVE_EXCLUSIVE case changes all bits
except the one required due to copy-paste error from clear_bit.
Cc: stable@vger.kernel.org # v5.2+
Fixes: f7c34874f04a ("xtensa: add exclusive atomics support")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: add exclusive atomics support2019-05-07T17:36:31+00:00Max Filippovjcmvbkbc@gmail.com2018-12-21T01:18:12+00:00urn:sha1:f7c34874f04a80d6c39a32f08da2529e59602d3c
Implement atomic primitives using exclusive access opcodes available in
the recent xtensa cores.
Since l32ex/s32ex don't have any memory ordering guarantees don't define
__smp_mb__before_atomic/__smp_mb__after_atomic to make them use memw.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: drop ifdef __KERNEL__ from kernel-only headers2019-05-07T00:48:54+00:00Max Filippovjcmvbkbc@gmail.com2019-05-06T20:07:26+00:00urn:sha1:8e65986dcae8c49501c1920064dc192e704248bb
These headers are not exported to userspace, so they're never used
without __KERNEL__ defined. Drop these ifdef statements.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: fix __ffs result type2016-07-24T03:33:29+00:00Max Filippovjcmvbkbc@gmail.com2016-04-25T01:06:37+00:00urn:sha1:12c8007dafbb7a9719d7beb04b79c9406c265f47
Make __ffs result type unsigned long to match generic asm
implementation. This fixes the following build warning:
mm/nobootmem.c: In function '__free_pages_memory':
include/linux/kernel.h:742:17: warning: comparison of distinct pointer
types lacks a cast
(void) (&_min1 == &_min2); \
^
mm/nobootmem.c:100:11: note: in expansion of macro 'min'
order = min(MAX_ORDER - 1UL, __ffs(start));
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
arch,xtensa: Convert smp_mb__*()2014-04-18T12:20:47+00:00Peter Zijlstrapeterz@infradead.org2014-03-13T18:00:35+00:00urn:sha1:09a01c0ccb1837abb28afcfdd668fa0dfabed928
Xtensa SMP has compare-and-swap which is fully serializing, therefore
its exising smp_mb__{before,after}_clear_bit() appear unduly heavy.
Implement the new barriers as barrier().
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-e9rqjxr1m1ejsob9p433kmji@git.kernel.org
Cc: Chris Zankel <chris@zankel.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-xtensa@linux-xtensa.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>